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{{Documentation subpage}}
{{COinS safe|n}}
This template allows you to render chemical formulas using HTML. Alternatively, you can use {{tag|chem}}, using [[Help:Displaying_a_formula#Chemistry|mhchem LaTeX]] notation to generate formulas.

<div style="clear: both;"></div>
==Template instructions==
This template, {{Tl|chem}}, serves to simplify the writing of chemical formulas. For example,
<pre>
{{chem|H|2|O}}
</pre>
will yield:
: {{chem|H|2|O}}

===Algebraic expression as subscript===
Algebraic expressions are rendered as subscripts (but must not contain upper case letters).
<pre>
{{chem|C|''n''|H|2''n''&nbsp;+&nbsp;2}}
</pre>
gives
: {{chem|C|''n''|H|2''n'' + 2}}

===Charge===
Ion charge superscripts (for: +/-) are also supported:
<pre>
{{chem|H|3|O|+}}
</pre>
yields a "+" as superscript:
: {{chem|H|3|O|+}}

Simultaneous subscripts/superscripts are automatically handled (use a hyphen for the minus sign):
<pre>
{{chem|SO|4|2-}}
</pre>
gives "2−" as superscript:
: {{chem|SO|4|2-}}
The hyphen is converted to a true minus sign.

===Atomic number and mass number===
The first parameter can be used for mass number.
<pre>
{{chem|4|He}}
</pre>
gives:
: {{chem|4|He}}

The first two parameters can be used for mass number and atomic number.
<pre>
{{chem|4|2|He}}
</pre>
gives:
: {{chem|4|2|He}}

;Note:
:Only the first two parameters can handle two consecutive plain numbers (i.e. without a plus sign or a hyphen (<code>+</code> or <code>-</code>) following). Otherwise the template will loop.

;See also {{tl|Nuclide|}}

===Linking===
The optional parameter <kbd>link</kbd> changes the formula into a link. For example:
<pre>
{{chem|link=water|H|2|O}}
</pre>
will yield:
: {{chem|link=water|H|2|O}}

Individual elements can be linked in the following manner:
<pre>
{{chem|[[Hydrogen|H]]|2|[[Oxygen|O]]}}
</pre>
gives
: {{chem|[[Hydrogen|H]]|2|[[Oxygen|O]]}}

==Notes==
*To include "=" in the formula, use "&#61;" For example, "<nowiki>{{chem|CH|2|&#61;CH|2}}</nowiki>" yields {{chem|CH|2|=CH|2}}.
**Or, don't use this template. For example, "<nowiki>CH<sub>2</sub>=CH<sub>2</sub></nowiki>" yields CH<sub>2</sub>=CH<sub>2</sub>.
*To include "≡" in the formula, use "&#8801;" For example, "<nowiki>{{chem|HC&#8801;CH}}</nowiki>" yields {{chem|HC≡CH}}.
*The template accepts up to twenty parameters in addition to <code>link</code>.
*This template uses {{tl|su}}.

==See also==
* {{tl|Chemical formula}}, which auto-links elements and common compounds
* {{tl|Chem2}}
* {{tl|Chem molar mass}}

== TemplateData ==
{{TemplateData header}}
{{collapse top|title=Template data|bg=#ccc}}
<templatedata>
{
"params": {
"1": {},
"2": {},
"3": {},
"4": {},
"5": {},
"6": {},
"7": {},
"8": {},
"9": {},
"10": {},
"11": {},
"12": {},
"13": {},
"14": {},
"15": {},
"16": {},
"17": {},
"18": {},
"19": {},
"20": {},
"21": {},
"22": {},
"23": {},
"24": {},
"link": {
"label": "Link",
"description": "Make the formula link to an article",
"example": "Water",
"type": "wiki-page-name"
}
},
"description": "Render chemical formulas using HTML. Alternatively, you can use <chem>...</chem>, using mhchem LaTeX notation to generate formulas.\n\nUp to 25 unnamed ordered parameters can be used with automatic detection of subscripts and superscripts.",
"format": "inline",
"paramOrder": [
"link",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"13",
"14",
"15",
"16",
"17",
"18",
"19",
"20",
"21",
"22",
"23",
"24"
]
}
</templatedata>
{{collapse bottom}}
<includeonly>{{sandbox other||
[[Category:Text-specific formatting and function templates]]
[[Category:Chemistry formatting and function templates]]
[[Category:Superscript and subscript templates]]
}}</includeonly>

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